Why am I receiving this error when using the vartestn function?

I tried the following code and received this error:

>> vartestn(Table.trialNum,Table.Sex,Table.ID,'TestType','LeveneQuadratic');

Error using internal.stats.parseArgs (line 42)

Wrong number of arguments.

Error in vartestn (line 98)

internal.stats.parseArgs(okargs,defaults,varargin{:});

Can anyone help me understand what these errors mean?

Answer 1

[Adam Danz]

In the code you shared, I see 3 inputs and one name-value pair.

vartestn(Table.trialNum, Table.Sex, Table.ID, 'TestType', 'LeveneQuadratic');

The syntax described in the documentation describes a max of 2 inputs followed by name-value pairs.

vartestn(x,group,Name,Value)

Furthermore, from the documentation, x can be specified as a matrix or column vector. If a grouping variable group is specified, then x must be a column vector. So, you have 1 too many inputs.

Decide which variable is your grouping variable and which variable contains the data you're testing.

[Victoria Helm]

Thank you!